Slush-pump valve



Patented Oct. 16, 1928,.

UNITED fs'TATEs GEORGE s. FosNAUen-AND BERNARD JOHNSON, or NAPLES, cALiJa'oRNrA.

' sLUsH-PUMP vALvE.

Application lled June 1,

This invention relates to valves and particularly to valves that are subjected to hard usage, for example,'slush valves of slush pumps. These pumps are usedffor pumping 1 in Aour invention.

water or liquid mud, and the material passin through the pump frequently carries pe bles or small pieces of rock. These obstacles lodge upon the seats of the .valves and cause considerable trouble by wearing out the seats and interfering with the tight closing of the valves. It has been attempted to einploy gaskets of rubber or similarsoft material, to insure tight seating of the valves, but these gaskets become macerated or chewed up by the repeated closing movement of the valve disk and are, therefore, generally unsatisfactory. The general object of the invention is to provide a valve offthis type having a construction at its seat which will operate topreventthe permanent lodgement of small solid objects, such as pebbles or small pieces of rock, on the valve seat, and which willoperate asa self-cleaning valve seat.

Further objects ofthe invention will appear hereinafter.

The invention consists' of the novel parts and combination of yparts to -be described hereinafter,` all of which contribute to pro-- duce an ethcieiit'slush pump valve.

A preferred embodiment of the. invention is described in the following specification,

while the broad scope of the invention is. pointed out in theappended claims.

In the drawings: Figure 1 is a vertical section through a valve and a portion of a valve chest embody-r igure 2 is aplan of our valve seat with the valve removed. v

In practicing the invention, we provide a `ring 1, the up'per end ofwhich constitutes Y the valve seat 2. The'said seat is formed of two substantially conical faces 3 which intersect to form an annular ridge 4. This ring v1 is slightly tapered on its outerside, that is tovsay, it has a slightly conical outer face 5 which is received in a corresponding tapered bore 6 in the wallf of the pump. f This taper is slight so that-'when the ring has been pressed firmly into place it will resistthe y high pressures developed under the valve.

The valve 8 reciprocates during the opera- 1:52?. seriai No. 195,637.

to fit against the-conical faces 3. yThe valve 8 1s attached to a stem 11 whichpasses up through a tubular guide 12 secured in-'the underside of a valve bonnet 13 which seats 60 over the opening 14 in the outer Wall of the valve-chest 15, through which the valve may.

be inserted. A coil spring 16 is provided over' the guide 12 which thrusts against the upper side of the valve 8 and presses it upon the 65 seat. The underside of the valve 8 is provid. ed with a yguide 17 in the form of wings, Ithe edges 18 of which engage theface of the cylindrical bore 19 of the ring.

The valve. 8 is received on aneck 20of be? 70" is provided on the underside o the v alve i with a viiut 23 which screws onto the threaded 75 lower end of the stem. 1 This spring washer yields when the nut is tightened up and assists "in lpreventing the n ut .from coming loose- The valve ring 1 and the valve disk.8 are made of hardened steel and the valve is used without any gasket. `rIhe result of this is that if any small objects such as pebbles, grit or small pieces of rock come onto the seat 3, they will be immediately ground up by the repeated closing movements of the valve; 8l

On account of the elevated ridge 4, it will be evident that the valve seat 3 is substantially self-cleaning and any material lodging on the seat'will naturally gravitate down oif of the seat. This is enhanced by the repeated closing movements of the valve as it descends onto its seat. In other words, thel action of the .valve is to grind up any vhard material that lodges on the seat aid eventually causes its gravitation off of the seat.

, 05 It is understood that the embodiment of the invention describedherein is only one vof the many embodiments this invention may take, andwe do not wish to be limited in the practice of the invention', nor in the claims, 100

to the particular embodiment set forth. What we claim is: 1. In a valve for a slush .pump to pump water carrying niu'd, 'sand and pebbles, the

combination of an annular seat of hardened 105 substantially conical faces t0 come upon th 110 said seat, said valve-disk having a gui e stem, means for'guiding the'valve stem to permit the valve-disk to rise olf its seat and return thereto, by the action of the pump, saidvalvedisk and seat cooperating when thevalve rises and returns to its seat to crush the sand or pebbles lodging on the seat.

, 2./ In a valve for slush pumps for pumping water carrying mud; sand and pebbles, the combination of a ring of hardened steel having an annular seat at its upper end, having substantially the cross section of an inverted V with vonly two substantially conical faces intersecting to form a ridge, a valve-disk having a substantially V-shaped groove with only two inclined faces to come upon said seat, said valve-disk having a guide stem eX- tending from the same, and means for guiding the said stem to permit the valve-disk to riseofi' its seat and return thereto by the action of the pump, said disk and said seat cooperating to crush the pebbles and sand carried in the Water and lodging on the said seat.

3. In a valve for a slush pump for pumping i water carrying pebbles and sand, the combination of a hardened steel ring having an annular seat at its upper end having substantially the cross-section of an inverted V with only two substantially conical faces intersecting to form a ridge, a valve-disk having a sub stantially V- shaped groove on its under face said seat, said disk and said seat cooperating in the reciprocation of the valve by the action of the pump, to crush sand and pebbles lodging between the groove and the seat, the said.

conical faces of the seat operating to guide material on the seat oi' of the same.

Signed at Los Angeles, this 18 day of May,

GEORGE S. FOSNAUGH. BERNARD JOHNSON. 

